public class Circular {
    Circle bottom;
    double height;
    void setBottom(Circle c) {
      bottom = c;
    }
    void setHeight (double h) {
      height = h;
    }
    double getVolme() {
      if(bottom == null) 
        return -1;
      else
        return bottom.getArea()*height/3.0;
    }
    double getBottomRadius() {
       return bottom.getRadius();
    }
    public void setBottomRadius(double r) {
      bottom.setRadius(r);
    }
}
